Using corrugated signs to heat your house (Tip: Don't burn them)

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This little experiment is fairly complex but it’s an interesting examination of forcing heat through corrugation in order to absorb head and blow it through your house this summer. Doable? Sure. Cheap? Sure. Kind of weird? Absolutely.

The presenters suggest that those plastic political signs in your neighbors’ driveways are a great way to gather waterproof corrugation without much expense. Whatever you use, however, you’re basically getting free energy.

My only question here is how to pump the heat out of the sheet without using more energy than you would by just running a heater. Any ideas? Maybe wind power? Mice?